Roll grinding machine



Jan 1940- N-. J. RITZERT ROLL GRINDING MACHINE Filed May 10, 1937 6 Sheets-Sheet l v TrmMnt/ NORMAN JZRITZERT, SMQMMW 1 f5 Jan. 2, 1940. N. .1. RITZERT ROLL GRINDING MACHINE Filed May 10, 1957 6 Sheets-Sheet 2 L NN.

J vcwto'u NORMAN J; RITZERT;

5 1 MAWW 1940- N. J. RITZERT 2,185,737

' ROLL GRINDING MACHINE Filed May 10, 1937 6- Sheets-Sheet 3 153 50 52 FIE.3.

NORMANJ'. RITZERT.

Jam 19404 N. J. RITZERT I ROLL GRINDING MACHINE 6 Shets-Sheet 4 Filed May 10, 1957 NORMAN I RITZE'R Jan. 2,1940. N. J. RITZERT ROLL GRINDiNG MACHINE Filed May 10, 1957 6 Sheets-Sheet 5 NORMAN J. mrzsk'r,

Jan: 2, 1940- N. J. RITZERT ROLL GRINDING MACHINE Y Filed May 10, 1957 6 Sheets-Sheet 6 m mvg L. I

ILIIII Ewen/ 0v NORMANI RITZERT,

Patented Jan. 2, 1940 PATET Fries ROLL GRINDING MACHINE Norman J. Ritzert, Dayton, Ohio, assignor to The Dayton Rubber Manufacturing Company, Dayton, Ohio, a corporation of Ohio Application May 10, 1937, Serial No. 141,684

'7 Claims.

This invention relates to abrading machinery,

and in particular, to a machine for accurately surfacing cylindrical rolls, such as rubber-covered rolls for printing machines.

One object of this invention is to provide a roll grinding machine, wherein the roll is urged against the rotatable grinding member by a second roll, thereby preventing the bulging and uneven grinding of the surface of the roll.

Another object is to provide a machine for grinding rolls composed of yielding material, the machine being arranged in such a manner that the roll is engaged .by a contact roller on one side thereof, and engages the grinding element on the opposite side so that bulging of the yielding material at diametrically opposite points is effectively prevented.

Another object is to provide a roll grinding machine of this character, wherein means is afforded for accurately controlling the parallelism of the roll-supporting shaft with the shaft of the grinding element.

Another object is to provide a roll grinding machine, wherein the roll is mounted upon a carriage which is reciprocable longitudinally and movable transversely of the grinding element shaft.

Another object is to provide a roll grinding machine, wherein the roll-supporting means and a contacting member for aligning the material of the roll are arranged upon a carriage which is adapted to be movable both longitudinally and laterally of the grinding element shaft.

Another object is to provide a roll grinding machine, wherein the roll of yieldable material to be ground is engaged by a contact roll mounted upon swinging arms having means associated therewith not only for accurately swinging the arms but also for rotating the contact roll.

Another object is to provide a roll grinding machine, wherein the grinding element consists of a cylindrical drum having a spirally wound strip of abrasive material mounted thereon.

' Another object is to provide a roll grinding machine of the type set forth immediately above, wherein improved means is provided for securing the strip of abrasive material to the supporting drum at the opposite ends thereof.

:In the drawings:

Figure 1 is a front elevation of the roll grinding machine of this invention.

Figure 2 is a right-hand end elevation of the machine shown in Figure 1.

Figure 3 is a vertical section taken along the line 3-3 of Figure 1.

Figure 4 is a section along the line 4-4 in Figure 1, showing the right-hand end of the grinding drum.

Figure 5 is a top plan view of the right-hand end of the grinding drum shown in Figure 1.

Figure 6 is a section, similar to Figure 4, taken along the line 5-5 in Figure 1, but showing the left-hand end of the grinding drum.

Figure 7 is a top plan view of the left-hand end of the grinding drum shown in Figure 6.

Figure 8 is a section along the line 8-8 in Figure 1., showing the means for supporting the right-hand end of the roll to be ground.

Figure 9 is a left-hand side elevation of the structure shown in Figure 8.

Figure 10 is a cross section taken along the line 3-40 in Figure 1, showing the means for regulating the alignment of the roll to be ground.

Figure 11 is a left-hand side elevation of the structure shown in Figure 10.

Hitherto, grinding machines for abrading the surfaces of work rolls, such as printing or coating rolls, have provided mechanism which urged one side of the work roll into engagement with the grinding drum. Ordinarily, such work, rolls are of yielding or resilient material, such as natural or synthetic rubber. The pressure by which the roll was urged into engagement with the grinding drum, under such circumstances, caused the work roll to bulge because of its re- 30 silient construction, this bulging reaching its maximum diametrical the line of contact with the grinding drum. The result of such prior devices was to cause a concavity or hollowed zone around the central portion of the roll. The machine of the present invention provides means for engaging the work roll on aline diametrically opposite the line of engagement of the work roll with the grinding drum, and therefore, to a large extent reduces this bulging effect with its resulting hollow grinding or concavity of the work roll.

In general, the roll grinding machine of this invention consists of a cylindrical drum having a spirally wound strip of abrasive material, such as emery cloth or sandpaper, firmly secured thereto. The roll to be ground ordinarily consists of yielding material, such as rubber, such rolls being used in printing, coating and paper- 5U making machinery. It is important that such rolls have a true cylindrical surface and not a conical or concaved surface. Any such deviations from a true cylindrical surface interfere with the proper action of the roll and detract from the quality of the work turned out by the machine in which it is used.

The present machine embodies means for accurately adjusting the roll in the machine so as to prevent its being ground conically, and also has other means engaging the roll for preventing uneven grinding of the surface. To this end the roll to be ground is supported upon devices enabling the adjustment of the roll shaft until it is in true parallel relationship with the shaft of the grinding drum, thereby preventing conical grinding. To prevent uneven grinding, the roll to be ground is engaged on the opposite side from the drum by a pressure roll having a true cylindrical surface and bearing against the yielding roll in such a manner as to reduce the bulging effect of the yielding material which would otherwise occur.

Referring to the drawings in detail, Figures 1 and 2 show one embodiment of the grinding machine of this invention as consisting of a frame, generally designated ii], having supporting members H for supporting a bed l2 (FigureZ) with parallel ways or ridges l3 and i4 thereon. Between each adjacent pair of ridges l3 and i4 is a level portion l5 which serves to receive the grind ing drum supporting members I5 (Figure 2). Mounted upon the upper portion of the supporting members I5 are bearing blocks I? arranged to rotatably support the shaft 28 of the grinding drum, generally designated l5. Superimposed upon the shaft l8 and bearing blocks ii are the bearing members 20 forming theupper half of each bearing.

Grinding drum construction The grinding drum l9 consists of a hollow cylinder having discs 2! and 22 at its right and left-hand ends (Figures 5 and '7). The discs 2| and 22 are provided with hubs 23 and 24 with set screws 25 and 25 for securing these hubs to the shaft l8. Ring-shaped members 27 and .23 are welded, as at 25, to the discs 2i and 22, and serve to support the cylindrical portion of the grinding drum l9 (Figures 5 and 7). Angularly disposed slots 30 and 35 extending inwardly from the ends of the grinding drum l9 serve to receive the 0pposite ends of the abrasive material strip 32. The latter consists of a long strip of abrasive mate rial, such as emery cloth wound in a spiral path around the drum, as shown in Figure 1.

The right-hand end of the abrasive strip 32 passes through the slot 30 (Figure 4) around the rounded edge 35 over a semi-cylindrical member 34 secured, as by the set screws 55, to the under side of the ring member 27. Likewise secured to the ring member 2'2, as by the cap screws 56, is a clamping member 31 having a concave mating cylindrical surface 38 adapted to engage the opposite side of the abrasive strip 32 from that engaged by the convex cylindrical surface of the member 3%. At its opposite end the clamping member 37 is provided with a convex cylindrical projectionfifi which clamp-s the extreme end of the abrasive strip 52 against the inner wall of the ring-shaped member 27. By tightening the cap screws 35 the clamping member 31 is caused to anchor the end of the abrasive strip 32 securely to the ring member 27.

The abrasive strip 32 then follows a spiral path around the grinding drum is to the opposite end thereof, where it passes through the slot 3!, the latter being arranged obliquely through the end of the grinding drum l9 (Figures 6 and 7). After passing through the slot 3i the end of the abrarnounted upon the worm shaft 82.

is supported at its opposite ends by the bearing sive strip 32 is securely clamped within the V-shaped portion All! of the swinging arm M, as

by the correspondingly shaped wedge member 42,

clamped in position by the cap screw 45. The

inner end of the swinging arm 4! is attached, by a pivot screw i l, to the boss 45 of the hub 24. The arm 4| is provided with a lug 55 havinga hole 41 for receiving one end of a tension spring 48, the opposite end of which is anchored. as

at 49, to the lug 513 secured, as by welding, to the inner side of the ring-shaped member 28. Consequently, it will be seen that when the abrasive strip 32 is clamped at the right-hand end of the grinding drum l9, in the manner shown in'Figure 4, and is wound spirally around the drumto the left-hand end thereof, the arm "M to which the free end of the abrasive strip 32 is anchored, maintains the strip 32 in a taut condition by means of the tension spring 48.

Carriage construction Mounted for reciprocation along the ways l3 (Figure 2) is a carriage 5!! having grooves 52 corresponding to the ridges or ways I 3, held in engagement therewith by the retaining plates 53, Secured to the under side of the carriage 5| is a stud 54 (Figure 1) upon which is mounted.

an anti-friction roller 55, provided with bearing balls 56.

shaft 59, supported in journals 6!] and iii upon the frame of the machine. vided with a sprocket-.52 having a hubfiS drivingly and slidably secured thereto, as at the.

engages a nut 69 secured by the screws 19 to a cross slide 1|. Mounted on the screw shaft 68 is a hand wheel 12 by which the screw shaft 68 may be rotated for moving the cross slide ii transversely across the carriage 5!. For this purpose the carriage 5! and cross slide H are provided" with cooperating dove-tailed ridges l3 and 1.4!,

respectively. 7

Integral with the cross slide ll and rising therefrom are spaced bearing bosses 15 (Figure 1) having bores 16, which rotatably support a shaft 11 having arms 18 and 19 mounted on its opposite ends. Mounted on the extreme righthand end of the shaft 11 is a worm gear 8|] having its threads meshing with the worm 8| bosses 83 and 84, respectively, and provided with anti-friction thrust bearings and 8B for resisting the thrust of the worm 8|. A spacing sleeve 8'! is arranged between the boss 84 and thrust bearing 85 (Figure 3).

.Mounted upon the shaft .59 and slidably and drivingly connected thereto by the splined portions 54, is a sprocket 88 (Figure l) meshing with a sprocket chain 89 which passes around and drives a sprocket 90, the hub of whichrotates loosely upon the shaft 7? and carriesa gear 9!. A yieldingly urged idler sprocket (not shown) is mounted on the cross slide II in a-conven tional manner to adapt the sprocket chain-89-to Theouter race of this roller 55 engages the cam groove 51' of a cam 58 mounted upon a The shaft 59 is pro- The latter ing corresponding holes the changing distance between the centers of its sprockets 88 and 90. as the cross slide II is moved transversely. The gear 9| meshes with a pinion 92 mounted upon a stud 93, which in turn, is mounted upon the swinging arm I9. The pinion 92 meshes with a pinion 94 similarly mounted upon a stud 95, and this pinion 94 in turn meshes with a pinion 96 mounted upon the pressure roll shaft 97, rotatably supported in the bores 98 and 99 of the arms 18 and I9, respectively.

1 Accordingly, when the shaft 59 is rotated by the sprocket chain 65 from the driving motor, the pressure roll shaft 9'I is rotated through the train of gears 9I,'92, 94 and 96, and rotates a pressure roll I00 carried by the pressure roll shaft 91. The pressure roll I00 may consist of metal, hard rubber, synthetic resin or other suitable material, hard rubber having been found suitable in one installation of the machine. The

pressure roll I00 is provided with an accurate I03 is rotated the rotation of the worm shaft 82 rotates the worm SI and with it the worm gear rigidly mounted upon the shaft 'II, thereby swinging the arms I8 and I9 also rigidly mounted thereon.

Work roll supporting construction Integral with the cross slide II and rising from the opposite ends thereof are pillars I 04, the top portions of which are provided with bores I05 for sup-porting the opposite ends of a shaft I06, rigidly mounted therein. The shaft I05 is provided with a groove I01 having approximately V-shaped tapering walls (Figure 3). Arranged upon the right-hand end of this shaft I 06 is a downwardly extending arm I08 (Figures 1 and 8) for supporting 'the'right-hand end of the work roll I02. The arm I08 is provided with a hub I09 (Figure 8) with a threaded portion III! adapted .to receive a 'cap screw III, which engages the rearportion II2 of a wedge-shaped member II 3 to force the latter into the groove I01 of the shaft IIIfiQthereby anchoring the arm I08 securely in any desired position along the shaft I 06. The vertical portion-H4 of the arm 1 I08 is provided with a cut-away portion II 5 having a plurality of holes II I5 adapted to receive dowel pins III for aligning a bar II8 hav- II9 for receiving the dowel pins II'I. This construction is provided for enabling the bar II8 to be raised or lowered and anchored securely in any one of a plurality of positions, as determined by the dowel pins III in the holes I I B. A cap screw I 20 passes through a threaded bore I2I in the arm portion H4 and engages the opposite edge of the bar IIU from the dowel pins II'I, thereby firmly securing the bar H8 in position. The lower portion of the bar H8 is provided with a rounded notch I22 for receiving the shaft I23 of the work roll I02, the latter being the printing roll or coating roll which is to be evenly ground in the machine.

In order to hold the Work roll shaft I23 securely within the notch I22, a clamping arm I25 is provided having its forward end engaging the work roll shaft I23. The opposite end of the arm I25 is provided with a smooth bore I26 surrounding the threaded end I2'I of a downwardly extending rod I28, the upper portion of which is adapted to move vertically within a vertical bore I29 and to be clamped in position by a cap screw I30 passing through a threaded bore I3I in a boss I 32 on the arm portion II4 (Figure 8). A knurled nut I33 serves to hold the clamping arm I25 firmly in engagement with the work roll shaft I23 within the notch I22, and at the same time, to permit the arm I25 to be swung to one side in order to enable the rapid removal and insertion of additional work rolls I02.

Likewise mounted upon the shaft I06 is an additional work roll support I34 having a similar function to the work roll support I08, but with an additional adjustment for insuring the parallelism of the work roll shaft I23 with the grinding drum shaft I8. This adjustment prevents the grinding of a conical surface upon the roll I02. For this purpose the support I34 consists of two relatively movable portions, namely, a pulleylike hub I35 mounted upon the shaft I06, and a supporting arm I36 mounte-dupon the hub I35 so as to be slightly movable around this'hub. The hub I35 consists of a sleeve-like portion I31 and an end flange I38 having a cap screw I39 adapted to engage the back I40 of a wedge MI and force the latter into the groove I0'I. By tightening the cap screw I39 the hub I35 may be securely anchored in any desired position longitudinally along the shaft I06.

The sleeve-like portion I3I of the hub I35 is provided with a recess I 42 which is accurately machined, therein and which is engaged by the eccentric head I43 of a rotatable pin I44 mounted in the bore I45 of the encircling portion I46 of the supporting arm I36. The pin I44 likewise passes through a boss I41, to which is secured an index pointer I43, as by the screw I49. Secured, as at I50, to the outer end of the pin I44 is a micrometer drum I 5I, the graduations I52 of which serve to indicate the position of the eccentric head I43 within the recess I42. A handle I53 is provided in the extreme outer end of the bear similar reference numerals. The left-handv end of the work roll shaft I23 may therefore be raised and lowered and clamped in position in a manner identical with that of the right-hand end, previously described in connection with the description of the support I00.

The encircling portion I43 of the arm I36 is in the form of a split hub having projecting portions I54 and I55 with tangential threaded bores I53 and I5; engaged by the threads of a clamping screw I50, the outer en-d of which carries an enlarged portion I59 with a transverse hole I60, carrying a-handle I6I. By turning the handle I6I the projecting portions I54 and I55 may be caused to approach one another, and the encircling portion I 45 of the arm I36 may be securely clamped in position after it has been adjusted by rotating the pin I44, in the manner previously described. A face plate I62 (Figure 10) is secured to the right-hand end of the sleevelikeportion L31, as by the set screws 63, there- Zbyretaining the parts in position.

Operation The grinding drum shaft I8 is rotated by means of pulleys I63 and belts I68 leading to a suitable driving motor (not shown). The work roll on is inserted in its supports Hi8 and H4, in the manner previously described, and adjusted so as to bring its shaft accurately into parallelism with the shaft 18 by the operations set forth above. The pressure roll Hid is then brought into engagement with the rearward surface of the work roll ass: by turning the hand wheel Hi3 so that the yielding surface of the work roll IE2 is supported longitudinally along its entire extent. The cross slide H is then moved forwardly by turning the hand wheel '52 until the work roll I92 approaches the grinding drum l9.

Meanwhile, the operation of the sprocket chain 65 has caused the rotation of the pressure roll Hill and likewise the longitudinal feeding movement of the carriage 5! by its engagement with the cam 58. Consequently, the engagement of the pressure roll Hi6 rotates the work roll Hi2, and the engagement of the latter with the abrasive strip 32: upon the grinding drum l9 rapidly and evenly removes the material from the work roll Hit. The formation of uneven ridges or grooves is prevented by the action of the cam 58 moving the carriage 5i longitudinally along the bed of the machine. The engagement of the even surface of the pressure roll ltd prevents the grinding drum it from causing portions of the work roll Hid to bulge rearwardly, and thereby causing concavities in the work roll i532.

It will be understood that I desire to comprehend within my invention such modifications as come within the scope of the claims and the invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In combination, a bed having ways, a carriage movable along said ways, a rotatable abrading member mounted adjacent said carriage, means for reciprocating said carriage relatively to said abrading member, means for supporting a work roll upon said carriage, means including a pressure roll for urging said work roll into engagement with said abrading member, a swinging mount for holding said pressure roll, and micrometric means for adjustably moving one portion of said swinging mount relatively toanother portion thereof to adjust the position of the axis of rotation of said pressure roll relatively to the axis of rotation of said abrading member.

2. In combination, a rotatable abrading member, a pair of spaced uprights, a shaft extending between said uprights and supported thereby, a pair of spaced arms depending from said shaft, means on said arms for supporting a work roll in engagement with said abrading member, said between one arm and said elongated member work r011 having a shaft supported by said supporting means, micrometrically adjustable means for swinging one arm relatively to the other arm to move one end of said roll shaft relatively to the other end to adjust the axis of said work roll 7 relatively to the axis of rotation of said rotatable abrading member, and means for rotating said work roll.

3. In combination, a rotatable abrading memher, a pair of spaced uprights, a shaft extending between said uprights and supported thereby, a pair of spaced arms depending from said shaft, means on said arms for supporting a work roll in engagement with said abrading member, micrometrically adjustable means for to move one end of said work roll relatively to I the other end to adjust the axis of said work roll. relatively to the axis of rotationof said abrading member, a pressure roll arranged to engage said work roll on the side opposite its line of engagea ment with said abrading member, and means to rotating said pressure ro1l.,

4. In combination, a rotatable abrading meme her, a frame, a carriage movable along said frame axially of said rotatable abrading member, a cross slide mounted on said carriage, means upon said cross slide for supporting a work roll, a plurality of swinging members mounted on said cross-slide, means for adjusting one of saidswinging members micrometrically relatively to the other swinging member, means on said swinging members for engaging said work roll on the side opposite said abrading member, and a train of gears mounted upon one of said swinging members for rotating said work-engaging means.

5. A device for adjustably holding a roll comprising an elongated member, a plurality of arms supported thereby, a hub-like member arranged between one arm and said elongated member, and "40 micrometrically adjustable means for moving said arm relativelyto said hub-like member.

6. A devicefor adjustably holding aroll comprising an elongated member, a plurality of arms supported thereby, a hub-like member arranged 1 5 cam said

and having a circular recess, a shaft rotatably' mounted on said last-mentioned arm, an eccentric on said shaft disposed in said recess, andv means for rotating'said shaft to rotate said ec centric in said recess whereby to swingsaid arm 1 0 relatively to said hub-like member-and to the other arm.

NORMAN J. RITZERT,.I.

adjustably ill; swinging one arm. relatively to the otherarm" said. 5 

